lnwallet: add additional BlockChainIO methods

lnwallet/btcwallet/blockchain.go

@@ -53,3 +53,28 @@ func (b *BtcWallet) GetTransaction(txid *wire.ShaHash) (*wire.MsgTx, error) {
 
 	return tx.MsgTx(), nil
 }
+
+// GetBlock returns a raw block from the server given its hash.
+//
+// This method is a part of the lnwallet.BlockChainIO interface.
+func (b *BtcWallet) GetBlock(blockHash *wire.ShaHash) (*wire.MsgBlock, error) {
+	block, err := b.rpc.GetBlock(blockHash)
+	if err != nil {
+		return nil, err
+	}
+
+	return block, nil
+}
+
+// GetBlockHash returns the hash of the block in the best block chain at the
+// given height.
+//
+// This method is a part of the lnwallet.BlockChainIO interface.
+func (b *BtcWallet) GetBlockHash(blockHeight int64) (*wire.ShaHash, error) {
+	blockHash, err := b.rpc.GetBlockHash(blockHeight)
+	if err != nil {
+		return nil, err
+	}
+
+	return blockHash, nil
+}

lnwallet/interface.go

@@ -210,8 +210,15 @@ type BlockChainIO interface {
 	GetUtxo(txid *wire.ShaHash, index uint32) (*wire.TxOut, error)
 
 	// GetTransaction returns the full transaction identified by the passed
-	// transaction ID.
-	GetTransaction(txid *wire.ShaHash) (*wire.MsgTx, error)
+ 	// transaction ID.
+ 	GetTransaction(txid *wire.ShaHash) (*wire.MsgTx, error)
+
+	// GetBlockHash returns the hash of the block in the best block chain at the
+	// given height.
+	GetBlockHash(blockHeight int64) (*wire.ShaHash, error)
+
+	// GetBlock returns a block by the given hash.
+	GetBlock(blockHash *wire.ShaHash) (*wire.MsgBlock, error)
 }
 
 // SignDescriptor houses the necessary information required to successfully sign